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Experimental single-impulse magnetic focusing of launched cold atoms

Smith, David A. and Arnold, Aidan S. and Pritchard, Matthew J. and Hughes, Ifan G. (2008) Experimental single-impulse magnetic focusing of launched cold atoms. Journal of Physics B: Atomic, Molecular and Optical Physics, 41 (12). pp. 1-7. ISSN 0953-4075

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Single-impulse three-dimensional magnetic focusing of vertically launched cold atoms has been observed. Four different configurations of the lens were used to vary the relative radial and axial focusing properties. Compact focused clouds of 85Rb were seen for all four configurations. It is shown that an atom-optical ray matrix approach for describing the lensing action is insufficient. Numerical simulation using a full approximation to the lens's magnetic field shows very good agreement with the radial focusing properties of the lens. However, the axial (vertical direction) focusing properties are less well described and the reasons for this are discussed.